Operation of fuel spraying or injections valve for internal-combustion engines.



H. E. FENCHELLE.

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OPERATION OF'FUEL SPRAYING OR I IIIECTION VALVES FOR INTERNAL CAPPLICATION FILED DEC.'6,I9|1- Patented Feb. 11, 1919;

Inventor.

W. L [1:46.] r7 2 241146 1 444x77 UNITED STATES Px'rmv'r OFFICE.

HUGH EMILE FENCHELLE, OF GENOA, ITALY, ASSIGNOR T0 WILLIAM L. KANN, OFPITTSBURGH, PENNSYLVANIA, TRUSTEE.

OPERATION OF FUEL SPRAYING OR INJECTION VALVES FOR INTERNAL-COMBUSTIONENGINES.

Patented Feb. 11, 1919.

. Application filed December 8, 1917. Serial No. 205,888.

To all whom it may concern:

Be it known that I. Hocrr EMILE Fen- CHELLE, a British subject, residingat Via XX Settembre 34/4, Genoa, in the Kingdom of Italy, have inventedcertain new and useful Improvements in Operation of Fuel- Spraying orInjection Valves for Internal- Combustion Engines, of which the following is a specification.

This invention relates to the operationof fuel spraying or injectionvalves of internal combustion engines, particularly those employing the,Diesel type of injection, and provides an improved construction ofcontrolling mechanism.

According to this invention a cam oper' aged sliding member angularlyadjustable a out the cam axis is formed with a bearing surface differentportions of which are brought opposite the end of the valve lever by t eangular adjustment, the extent of movement of the lever depending uponthe portion of the said bearing surface which is operative. In theconstruction preferred the sliding member is formed with two bearingsurfaces separated by 9. ga or de ressi'on which when brought oppositethe ever end leaves the valve unoperated'by the cam. One of the said twosurfaces is employed for forward movement of the engine and the otherfor reverse movement, and each of them'is so constructed that it iswholly within an arc of a circle struck from the axis of the cam. shaftat a radius ual to the distance of the outer edge of t is surface fromthe said axis, this outer edge correr of which projects the spending tothe maximum. ower of the engine. When the arm is a justed for re ducedower, a certain amount of lost motion wll be provided between the camand the valve lever, the amount of such lost motion being dependentuponthe position of the said am.

In order that the said invention may-be more clearly understood andreadily carried into efiect the same will be more fully described withreference to the accompanying drawing, which shows in elevation withparts in section, an injection valve and valve operating mechanismembodying this inven- A is the valve body through the upper end I valvestem 0. B is the va ve lever one endof which actuates 'cedes from thethe valve stem a through the adustable not a on the end of the stem. isthe valve cam having the two cam surfaces 0 and mounted upon the camshaft 0, which turns at half the speed of the engine shaft.

D is the sliding valve actuating member carrying the cam roller d andmounted in the sleeve e of the arm E which is pivoted to turn about theaxis y of the shaft 0.

is an eccentric effecting the adjustment of the arm E around its axis 3through the eccentric rod f.

The forward end of the sliding member D acts upon the nose I) on the endof the valve lever B and is provided with the two bearing surfaces cland d for forward and reverse driving of the engine and with the recessd" separating the two bearing surfaces. As s own on the drawing an areas of a circle drawn from the axis y of the cam shaft 0' through theouter edges of the two surfaces d, d lies entirely outside thesesurfaces, which may with suitably formedcam surfaces c, be made flat andlie in the same plane, which is therefore tangential to an arcconcentric with the are m,

ut struck nearer to the axis In the position shown in the drawing t earm E is at or near the position of maximum power, with a point I on theouter portion of the surface d opposite to the nose I) of the valveleverB. At this point very little lost motion is allowed between the camand the lever, since the roller d almost rests upon the surfaces of thecam so that the cam surfaces a begin to operate the lever immediatelthelr leading edges reach the roller d. I however the power of theengine is to be reduced the eccentric F is turned by suitable gearing,which may be under the control of the engine governor, so that the arm Eis drawn down around its axis y bringingla point on the surface (1 whichis nearer .t e center of the member D op osite to the nose 6 of thevalve lover. The arger the displacement of the arm E the eater is thegap between the nose b and t e operafive point of the surface d, sincethis reare m as it approaches the. axis of the member D, and the lostmotion between the cam and the valve lever therefore increases with thedisplacement of the arm E and the period during which the lever isoperated and the injection valve adjustmept of throu held open isreduced in accordance with the smaller portion of the cam surface 0coming into effective operation.

The adjustment of the arm E in the direction just mentioned, Whilevarying the amount of clearance or lost motion between the cam andlever, at the same time shifts the position of the roller (Z on thesurface of the cam against the direction of rotation of the cam so thatthe cam surface 0 reaches the roller d at an earlier point on the enginestroke. As however, the cam surface 0 does not become effective untilthe member D has taken up the lost motion allowed for, only the upper orouter portion of the cam surface serves for valve actuation, theeffective amount of the portion depending upon the the arm E. Bysuitably shap e cam surfaces 0 in accordance with the shape of thebearing surfaces cl, 0' the displacement of the arm E around its axismay be made just to compensate for the delay due to the lost motion, sothat the point in the engine stroke at which the cam surface 0 opens theinjection valve ma re main constant for any adjustment 0 the device Theperiod e remains open, howupon the adjustment valve lever actuatinduring which the val i ever, depends entirely of the arm E and theconsequent variation in the amount of lost motion between the cam andthe valve lever through the bearing surface d or d of the member I). Theperiod of opening of the valve therefore may be made to correspond withreasonable accuracy to the amount of fuel being delivered to the valveand to the consequent power developed by the engine so that there is nodanger of any fuel which may remain in the valve being drawn into thecylinder after the supplyv to the valve is cut off.

On further movement of the arm E h the eccentric F the steadi y reducinthe period of opening of the injection va ve, ma be moved completely astthenose/b so as to bring the recess 3 opposite this nose. In thisosltion of the device the valve remains entirely unoperated as the camsurfaces a merely surface d, after move the member D forward withouttransmitting such movement to the valve lever. In this position the fuelis entirely out ofl" from the engine, which therefore stops.

On further movement of the arm E the second bearin surface d is broughtopposite the nose of the valve lever, this surface coming into operationfor reverse running of the engine. The action of the valve device isprecisely similar for both forward and reverse running, the period ofopening of the valve and consequently the power of the engine increasingas the outer portion of the surface d is brought opposite the nose I).As the surface d is formed in accordance with the shape of the camsurfaces 0 the time of opening of the injection valve can be keptconstant for any adjustment of the valve during reverse running, as inthe case of forward runnin already 'dealt with.

It is preferred to mafie the adjustment of the arm E between the twoextreme positions, for forward and reverse running at full power, withinan angle of about 15 degrees and to allow of the operation taking placewithin this small angle the cam is provided with the two cam surfaces 0and is driven at half the usual cam shaft speed.

What I' claim and desire to secure by Letters Patent of the UnitedStates is I The combination with a valve lever to be actuated, saidlever having its power arm provided with a convex nose portion, of arotary cam, a sup ort which is angularly adjustable about t c axis of.the cam, a transmission member slidably mounted on said support andarranged to be actuated by the rotary cam, said member having a contactface for engagement with the said nose portion, said ace having twoseparated plane bearing surfaces lying within a circle struck from theaxis of the cam and meeting the outer edges of said surfaces, and meanswhereby the said support maybe gradually shifted to vary the-contactpoint between said nose portion and either-one of said sur faces;substantially as described.

HUGHEMILE FENCHELLE.

